Disk-sharpener



(no. Mqdel.) amete-sheet 1;

A. CHRISTOPHERSON. DISK SHARPEN'ER.

No. 603,172. v Patented Apr. .216, 1898.

E Q a WITNESSES: WVENTOH Mk0 401w Ckrz'slpkc rJ'on A 7'7'ORNEYS (No Md 1. 0 e CHRISTOPHERSON; 2 W

' DISK SHABPBNER. No. 603,172. Patented Apr. 26, 1898.

A TTORNEYJ.

UNITED STATES PATENT OFFICE.

ARNE OHRISTOPHERSON, OF CANTON, SOUTH DAKOTA.

DlSK-S HARPEN'ER.

SPECIFICATION forming part of Letters Patent No. 603,172, dated April 26, 1898. Application filed June 13,1895. Serial No. 553,249. (No model.)

To all whom it may concern.-

Be it known that I, AnNE GHRIsrorHERsoN, a citizen of the United States, residing at Canton, in the county of Lincoln and State of South Dakota, have invented certain new and useful Improvements in Disk-Sharpeners; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The object of my invention is to provide a disk-sharpener for use in sharpening harrowwheels and other wheels of like character which will be simple in construction, which will automatically adjust itself to sharpening irregular or wabblingdisks as well as regular disks,and which will be capable of adjustment to sharpen a disk at any angle desired.

In accomplishing the object of my invention I mount the disk to be sharpened upon a shaft which is rotated -by suitable power mechanism and provide a second or supplemental shaft parallel to the first or main shaft, but at a distance, therefrom greater than the radius of the disk to be sharpened, upon which is adj ustably mounted a support for the sharpening-knife. The support for the sharpening-knife is made in two parts, which are hinged or jointed together, so as to allow the upper part to move independently of the lower part and thus to follow any irregularity in the surface of the disk being sharpened. The sharpening-knife itself is adjustably secured in the end of the upper section of the knife support and is held pressed against the edge of the disk to be sharpened by a spring-guide. This guide consists of an angled arm on which are mounted two trolley-wheels, which roll upon the outer surface of the disk being sharpened. The angled arm is pivotally connected to an arm rigidly held at right angles to the sharpening-knife. The pressure with which the trolley-wheels bear against the disk-surface is regulated by the adjustment of a spring connecting the two parts, so that the sharpening-knife may be held with any desired degree of firmness against the surface being sharpened. The sharpening-knife itself is so made that it can be removed and replaced at will, so that by using different forms of sharpening-knives any desired angle can be given to the edge of the disk, being sharpened.

My invention is fully illustrated in the drawings which accompany and form a partof this specification, in which the same reference letters and numerals refer to the same or corresponding parts, and in which Figure 1 is a perspective view of my disksharpener, showing a series of harrow-wheels in position on the main shaft to be sharpened. Fig. 2 is a detail viewof that one of the harrow-wheels which is about to be sharpened, showing the sharpening-knife and knife-support. Figs. 3 and 4 are details of the knifesupport.

- Referring to the drawings, A represents the frame of the sharpener. On this frameare mounted supports B for the main shaft O, the bearings 19 being adjustable, so as to permit the shaft to be readily removed from the frame for the purpose of putting on the same the disks which are to be sharpened and removing disks already sharpened. The shaft 0 is rotated through the action of the meshing gears 1 and 2, gear 2 being keyed to the power-shaft 3, to which power is conveyed by the belt-Wheel 4.

On the main shaft 0 are mounted, as has just been stated, the disks to be sharpened. The disks D shown in the drawings are harrow-wheels, and, as shown, a number of the wheels or disks can be placed on the shaft at the same time, so as to permit them to be sharpened successively without necessitating readjustment of the machine after the sharpening of each disk. The disks are held a suitable distance apart from each other on the shaft by spaces 0, which may be of any desired shape. The harrow wheels or disks are secured. firmly to the shaft, so that they rotate with the same.

The knife-sharpener E is adj ustably mounted upon the supplemental shaft F, which is parallel to the main shaft C,-but at a distance therefrom greater than the radius of the disk to be sharpened. The supplemental shaft F is itself mounted upon the studshafts f, which pass through the ends of the same, being held on the stud-shafts by the set-screw f. In this manner adjustment of the distance between the centers of the main and supplemental shafts is possible and provision is made for the sharpening of disks greatly differing in diameter.

The supplemental shaft F is, in effect, a slide-bed, upon which the knife-support can be adjusted. With it there is possible an adjustment of the knife-support axially of the shaft as well as lengthwise of the shaft. This is a feature which I believe to be new in the art and which I have found to be of great utility.

The knife-support E is made in two portions or sections, the lower part E, which is held in any given position on the supplemental shaft by the set-screw e, and the upper part E which bears the sharpening-knife and the mechanism employed to hold the sharpening-knife against the surface of the disks being sharpened. The connection between the two parts of the knife-support E is pivotal in its character, so that the upper part of the support can move relative to the lower part and can thus follow any irregularities of the surface of the disk being treated. The sharpening-knife G passes through an opening made therefor in the knife-support and is held in position by a set-screw g. Any character of cutting-knife may be employed, and by changing the knives edges of different angles may be given to the disks being sharpened. The sharpening-knife is held against the surface of the disk being sharpened by the spring-support I-I, consisting of the bracket II, extending outward from the knife-support at right angles thereto, and the angled arm H pivotally secured to said bracket and bearing on the ends of its angled portion trolley or friction wheels 7L2. The length of the angled arm H is such that the trolley-wheels 7L2 always bear against the surface of the disk at some little distance from the periphery thereof, insuring the sharpening-knife being held firmly against the surface of said disk. The pressure with which the trolley-wheels bear against the disk-surface can be adjusted by adjusting the screw I, which connects the bracket H with the angled arm H the spring J acting to force the angled arm H and bracket H together.

The construction which I have thus described enables me to sharpen disks of any diameter and however irregular in outline quickly and easily and to give their edges any desired angle. A number of disks can be on the sharpening-shaft at the same time, so that the adjustment from one disk to another is only the matter of a moment.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. I11 a disk-sharpener, the combination with a frame, a shaft adapted to have mounted thereon the disks to be sharpened, bearings therefor, and means for rotating said shaft, of a supplemental shaft parallel to said main shaft, and distant therefrom more than the radius of the disk to be sharpened, a knifesupport adj ustably mounted thereon, and solely carried thereby and a sharpening-knife, substantially as described.

2. In a disk sharpener, the combination with a frame, a shaft adapted to have mounted thereon the disks to be sharpened, bearings therefor, and means for rotating said shaft, of a supplemental shaft parallel to said main shaft and distant therefrom more than the radius of the disk to be sharpened, a knifesupport consisting of two sections, one section being adj ustably mounted 011 said supplemental shaft, and solely carried thereby and the other section, bearing the sharpeningknife, being pivotally connected to the outer end of the first section, a knife, and means for holding the same against the edge of the disk to be sharpened, substantially as described.

3. In a disk-sharpener, the combination with a frame, a main shaft adapted to have mounted thereon the disks to be sharpened, bearings therefor, and means for rotating said shaft, of a supplemental shaft parallel to said main shaft and distant therefrom more than the radius of the disk to be sharpened, said supplemental shaft being adjustable as to its distance from the main shaft, a knife-support consisting of two sections, one section being adjustably mounted on said supplemental shaft, and solely carried thereby and the second section bearing the sharpening-knife,and being pivotally connected to the outer end of the first, a knife, and means for holding the same against the edge of the disk to be sharpened, substantially as described.

4. In a disksharpener, the combination with a frame, a main shaft adapted to have mounted thereon the disks to be sharpened, bearings therefor, and means for rotating said shaft, of a supplemental shaft parallel to said main shaft but distant therefrom more than the radius of the disks to be sharpcned,a knifesupport adjustably mounted thereon, said knife-support being made in two parts hinged together, a knife, and a bracket H, angled arm H bearing trolley-wheels 71. screw I, and spring J for holding said knife against the disk to be sharpened, substantially as described.

ARNE CIIRISTOPIIERSON.

Witnesses:

H. N. Coornn, A. \V. IIAWN. 

